Trisha is cold and puts on a sweater . in a few minutes she feels warmer why

Molten iron fills a mould, which has a volume of 200 cm cubed. calculate the volume when the iron cools and solidifies.

Karen is running forward at a speed of 9 m/s. she tosses her sweaty headband backward at a speed of 20 m/s. the speed of the headband, to the nearest whole number relative to a stationary observer watching karen

When you push downward on a book at rest on a table, you feel an upward force. does this force depend on friction? defend your answer.